That's weird! I thought that the 72V went straight to the motor, else it wouldn't make sense to use 72v otherwise? The motor gets hot while climbing, so driving it with 72V would reduce the amp rating for the same power output, the hub would get hot slower at 72v. Why would the controller change a 7...

Hey thanks, I just checked all the safety videos for LiFe battery short circuits and nailgun tests, The short triggered the safety, and the nailgun made the pack warm and smokey, although there weren't flames. I went to get another 35 kilos of them, and in the end my arm was not long enough to reach...

Yes, good idea. I think i'll go round and get another 2000 this evening if they are still there... The first test was a 1600mAh battery, it came in at 1634 on accucell, only from 3.6 to 2.8 at 1C ... cool!

Hey cool advice! thanks for the directions. I'm just checking one of the 2018 cells at 0.7 amps / 0.5C charge, If they have more than 80% of their original value it would be worth going up to get 4000 of them to give/sell to people doing their camper vans and things. I have two bags with about 1000 ...

I went to the recycler place to throw out a hifi and I found that there is half a bin full of brand new looking lithium batteries unwelded dated 2015 to 2019 1500 to 1800mA... It's from a company that does a bunch of lithium outfitting near where I live. I'd feel like an idiot if I let 2000 batterie...

Ah that's very interesting. The model 3 technology does also bring in a major efficiency advantage, i've heard figures of 96-97%. The raven edition of the model S using the hallbach technology has 10% higher range. Especially on highways at speeds higher than 80-100mph, the previous motor was strugg...

Hey folks, I have figured out how to make a carbon fiber torque arm. Some of you have probably previously welded one of these and think "duh that's obvious I already did that"... it took me ages to figure out that this is the best way. Advantage : Micron accuracy, efficient with time, can be glued s...

You need a specific controller for the brushed motor which has regen. The regen resistance may be variable. A high level can stop a vehicle on a medium slope say 7%. Its a complement for standard brakes.

You can buy bms which have an led for every group but they draw current at idle. You can use a spare bms 15pin molex and wired soldered to the cells and check the pins if you are worried. You can find/ make 14 volt cubes for 14 usd and place them on a 15pin molex .Everyone, even noobs, uses a bms. U...

Just take care not to short the metals and measure all the bits you can see... you will get an idea. If you can find the first group with battery negatives, on the end, thats -, andcsearchbyour way up from there with the meter, it shout go 3.5-7-10-13 multiples of 52/13 or whatever.

I set fire to a a Sanyo cell from 2018 in a controlled environment, I melted through the steel using a 100A current, by placing some battery terminals on either side of the negative terminal. The battery flashed as the steel and copper vaporized, and then it started burning the lithium inside. It wa...

those are interesting links thx for that . correct me if i im wrong but adding cement is just so that the metal do not turn red right or( transfer heat to adjescent battery right if multiple pack)? the amout of flames that would go out in the end woud be the same as if put in the amo bow without ce...

those are interesting links thx for that . correct me if i im wrong but adding cement is just so that the metal do not turn red right or( transfer heat to adjescent battery right if multiple pack)? the amout of flames that would go out in the end woud be the same as if put in the amo bow without ce...

is this the exact title or just words of searching that came to your mind cause i see alot of vid but none with fireplaceinsulator in the list it gives me. Sorry I thought that they were easier to find. maybe it was "battery bunker" ... steel box lined with thermal plasterboard, pyrocrete, refracti...

Cool concept! Perhaps they have flown it for a minute, that would be cool too. BMW has signed something with them, although i am skeptical. It has to fly and land precisely with 5 motors, and have same energy as 5 roadsters to fly for just 2 hours, 420kwh, so every fuel cell is at least a 75kwh fuel...